Hello,Grrr. I just can't get SDA/SCL to drive servos via the PCA9685 PWM breakout, using the 'servo' example <Adafruit_PWMServoDriver.h> ...On both UNO & MetroMini, I can get a 128x32 I2C OLED to work fine, so I think I know that SDA & SCL work ok;and servos work fine when driven with pin-direct PWM, i.e. the Servo 'sweep' example code, so I think I know the servo pinouts are clear...

But no motion from 'servo' code, using pwm.setPWM()... :(Servos do step in one direction several steps each time I connect/reconnect power, but that's all...I've confirmed grounds, tried various combinatorial variations on the 3 servo leads, varied min & max pulse-width, etc...

I dont know how to diagnose / systematically debug any further - its a bit of a black box (without a scope, or analyzer, etc...)Any suggestions?TIA

Hi support_bill;I've posted a few more photos here. I have a separate 5v power supply for the servos. I plugged it back in for the latest photo, so the light is green.

IMG_0821.JPG (452.77 KiB) Viewed 203 times

IMG_0827.jpg (170.35 KiB) Viewed 203 times

N.B. Noticing a reply in a recentI2C servo driver thread on this forum ("Trouble with my second..." by grizzlyprototypes), I tried the 'I2CScanner' code. All I get is "No I2C devices found", with the 9685 plugged in on SDA/SCL.Plugging in my 128x32 OLED display, into the same SDA/SCL pins, I get "Device found at address 0x3C", as expected...